Furnace-controlling device



Nov. 11, 1930. T. w. PRICE 1,780,942

FURNACE CONTROLLING DEVI C E Filed Nov. 24, 1928 iii! INVENTO J? v mm 7M fi q Patented Nov. 11, 1930 PATENT oFncE W. PRICE, OF NEW BRUNSWICK, NEW JERSEY FURNACE- CONTROLLING DEVICE Application filed November 24, 1928. Serial No. 821,626.

This invention relates to a furnace controlling device, and an object of the'inv'ention is to providea simple and eflicient device for supplying forced draft to the furnace and for at the same time supplying a1r in adjusted proportional quantity to the upper portion of the fire pot of the furnace.

A further and more detailed object is to provide a blower device for feeding air through a. pipe into the ash pit of the furnace, to provide aby-pass from said plpe by which a portion of the air may be fed to the upper part of the fire pot of the furnace, and to provide suit-able valve mechanlsm by which to readily control the passage of a1r through saidpipe and said by-pass.

A further and detailed ob ect is to so arrange the valve mechanism that the shutting off of the passage ofair through the pipe to' the ash pit will automatically result 1n proportionall altering the amount of air sent through t e by-pass to the upper portion of the fire pot. v

A further object is to provide a blower device, including an electric motor, and to mount said device and connect it with the furnace, so that the device, including the mot0r, will have a-limited free movement with res ect to the furnace suflicient to absorb or dissipate the greater portion of the sound and vibration incident to the operation of the motor. a

Other objects and aims of the invention, more or less specific than those referred to above, will be in part obviousand in part pointed out inthe course of the following description of the elements, combinations, ar-' rangements of partsand applications of principles constituting the invention; and the scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawings which are to be taken as a part of this specification, and in which I have shown .merely a preferred form of embodiment of the invention I Fig. 1 is a top plan view of a furnacecontrolling device constructed in accordance with this invention. I I

Fig. 2 is a front elevational view of the device seen in Fig. 1 and showing the same connected with a furnace.

Fig. 3 is a transverse. detail sectional view taken upon the plane of line III,-III of Fig. 2, and r Fig. 4 is a horizontal sectional view take upon the plane of line IVIV of Fig. 2.

Referring to the drawings for describing in detail the structure therein illustrated, the reference character L indicates a blower casw ing having the discharge nozzle or pipe 1 extending eccentrically therefrom toward the ash pit of the furnace. The end portion of this pipe adjacent the furnace terminates short of the furnace but is connected there with by means of a flexible hose section as 2, said hose section being held to the end of the pipe by any appropriate means, as 'for instance by the use of a clamp collar 3. A metallic sleeve member 4 is fitted through an appropriate opening in the wall of the furnace ash pit and-a second clamp collar as 5 serves to connect the flexible section 2 with said sleeve. The blower casing L is formed integrally with or rigidly connected to the housing of an electric motor G, the rotor ofthe motor having fixed thereto a fan element as 6 rotatable within the casing L in a well understood manner. v Q I I The motor, and the casing L etc., as described, may be supported upon the floo'r 7 in any appropriate manner, but it is a feature of this invention to'so mount said parts that the vibrations and hum of the motor will not be imparted either to the-floor or to the furnace. A convenient and very eflicient method of mounting is illustrated hereinconsisting of a' plurality of'spring standards as c'onnected together by a frame 9 and havmg coil tension springs 10 suspended from their upper ends, with a motor platform v11 carried at the lower ends of said coil springs collectively. The motor G rests upon the 4 platform 11 and is freely movable therewith .in all directions. The vibratory motion of .the motor is transmitted first to the lower ends: of the springs 10 and through said springs to the upper ends of the spring standards which effectually complete the absorpyieldingly centered to a suflicient extent so that the location of the motor isdefinitely determined within desirable limits.

The flexible hose connection 2 is of a char-- acter to complete a closed passage between the blower and the ash pit while at the same time permitting substantially unobstructed vibratory movement of the motor and blower without transmittingt-he movement to the furnace.

Within the pipe 1 is arranged a valve or damper member 12 having an operating handle 13 extending exteriorly of the pipe by which the damper may be readily opened and closed at will. clamp screw, or other appropriate means, as 14 may be carried by the handle for engaging against the pipe to hold the valve in any position to which it is moved.

By means of this valve the amount of air driven by the fan 6 into the ash pit of the furnace may be controlled atall times irrespective of the speed of the fan.

At a suitable point in the wall of the pipe 1 there is provided an opening 15. A hollow extension 16 is arranged exteriorly of the pipe in continuation of this opening, and into this extension is fitted one end of a pipe H. The pipe H is'freely longitudinally movable in said extension so that it may be adjusted to dispose its inner end projecting any desired distance into the pipe 1. The inner end is beveled off as at 17 said bevel being arranged so that the toe as 18 thereofis further from the fan 6 than is the heel 19 of said bevel.

Any appropriate means may be employed for retaining the pipe H in adjusted osition,

but for this purpose the drawing il ustrates merely a clamp screw as 20 threaded through the extension 16 for clamping against the pipe H as will be readily understood. Upon release of the screw 20-the pipe H may be adjustedinto or out of thepipe 1, tightening of the screw suflicing to maintain the adjust-- ment.

The pipe H is flexible, being preferably formed of ordinary commercial flexible metallic tubing and its upper end extends through an appropriate opening in the furnace wall at a point above the furnace grate 21 and into the upper portion of the fire pot. The portion of the pipe H which projects into the extension 16 of pipe 1 may if desired consist of a relatively'stifi' short section of the metallic tubing fixed in any appropriate manner to the lower end of the flexible portion of the pipe.

The amount of air driven through the pipe H during theuoperation of the device will depend upon two elements, first, the degree of closure of valve 12, and, second, the degree to which the toe,18 of the pipe H is projected into the pipe I. The further the toe 18 projects the more directly it will stand in the main line of movement of the air blast from the fan 6 and the greater will be the consequent divergence of air into the pipe H. Also, the more nearly closed the valve 12 stands the greater will be the pressure of air between the valve and the fan, and since the pipe H is positioned in this region of the former, and vice versa. At the same time the amount. of air moving through the pipe H'may be further modified at will by the 'simple adjustment of moving it more or less into the pipe 1- as above described.

It may be here mentioned that adjustment of the valve mechanism described, that is of thevalve 12 and of the position of the toe of the pipe H, is not ordinarily intended to be altered exceptin adjusting the furnace control to a given furnace. That is to say that these valve devices are intended primari- 1y for adjustment onl when a furnace-controlling outfit is being mitially installed upon a given furnace. It is practical to use a given size of outfit upon furnaces of different sizes and in the presence of chimney and other draft restrictions differing widely from each other. Once the valve mechanism is adjusted to a glven furnace it is rarely necessary to subsequently disturb the adjustment although it will be understood of course that the adjustment may be modified to any desired extent at any time.

It is further to be noted that by utilizing a flexible hose or tube for the pipe I-I said hose or tube provides the desired by-pass for air into the upper portion of the fire pot without interfering with the free. vibratory movement of the motor and its related parts and without transmitting said vibratory movements, or the hum of the motor, to the furnac'e.

The purpose of the by-pass pipe H is to feed a certain measured amount of air into the upper portion of the fire pot, that is into the open space above the bed of coals on the grate 21, the amount of air thus' fed being in a certain predetermined proportion with respect to the amount driven into the ash pit, beneath the grate 21, through the pipe 1. The amount of air fed into the u per portion of the fire pot is intended to be ust suificient to supply the right amount of oxygen to support complete combustion of thegases rising from the burning coals. At the same time it must not be so great as to in any material way interfere with the draft or blast moving upthe accompanying drawings, shall be interpreted as illustrative only and not in a limitmglsense.

aving thus described my mvent1on, what I claim as new anddesire to secure by Letters Patent is':--

1. In a furnace controlling device, in combination, a furnace, a blower, a motor for driving said blower, a pipe extending from the blower adapted to be connected with one part of said furnace, said pipe having a late'ral opening through the wall thereof, a

second pipe extending throu h said 0 enmg having its inner end bevelec l off to ace in the general direction of the blower, means whereby said second pipe is adjustable to move said inner end to a greater or less distance into the first pi e, said second pipe bein adapted to exte'n into connection with a di erent part of said furnace, and a manually adjustable valve within the first pi e beyond but in close proximit to the inward y projecting end of the secon pipe.

2. The combination, with a furnace having a grate, .a combustion chamber above the grate and an ash pit below'the grate, of a motor, a blower comprisin a fan driven by said motorand a fan housing rigid with the motor having an air discharge pipe extending rigidly therefrom and supported thereby, means completing a closed air conduit I from said air discharge pipe into the ash pit of the furnace, means forming a secondair conduit between the blower and the combustion chamber of the furnace being connected in supported relation upon the blower and the furnace, bothof said air conduits forming means being ofa resilient character in order to decrease the inherent tendency of the motor and blower while in action to transmit vibratioii to the furnace and connected parts, and a a carrying device by which the motor and the parts by which the motor and the elements rigid therewith are resiliently supported in order to decrease the inherent tendency of the motor and blower while in action to transmit vibration to the furnace and connected parts, a separately formed sleeve mounted upon the furnace at an opening into the ash 'pit, said sleeve being spaced from the outer end of said discharge pipe, a section of hose connected by its opposite ends to said sleeve and pipe to complete an air conduit between the blower and the ash pit, means forming a second air conduit between the blower and the furnace also comprising a section of hose and having one end connected in supported relation upon thefan housing and having its other end connected in supported relation upon the furnace in communication with the combustion chamber, and both of said sections of hose being readily flexible to thereby further prevent vibration of the motor and blower from reaching the furnace and its connections.

In testimony whereof I aflix my signature.

THORNTON w. PRICE.

parts supported thereby are mounted re-"- siliently.

3. The combination, with a furnace having a grate, a combustion chamber above the grate and an ash pit below the grate, of a motor, a blower comprising a fan driven by said motor and a fan housing rigid with the motor having an air discharge pipe extending rigidly therefrom and supported thereby,

a carrying device adapted to rest upon the floor beside the furnace and having spring 

